Question

Which of the following statements is true?
a. "Peptidoglycan is found many in cell walls of fungi, algae and plants"
b. Peptidoglycan is a fatty acid
c. Gram positive bacterial walls have a relatively thin layer of peptidoglycan anchored to the cytoplasmic membrane by teichoic acid
d. The cell walls of bacteria are composed of peptidoglycan

Answer 1

Answer:

d. The cell walls of bacteria are composed of peptidoglycan

Explanation:

Bacterial cell wall is made of peptidoglycan or murein. It is made of sugars and amino acids. Sugar component consists of N-acetylmuramic acid  (NAM) and  N-acetylglucosamine (NAG) alternating residues. A peptide chain of three to five amino acids is attached to NAM.

Gram positive bacteria have thick cell wall made of many peptidoglycan layers. Whereas gram negative bacteria have a thinner layer. The peptidoglycan cell wall is required for the survival of the bacteria hence it is targeted by many antibiotics like penicillin.